1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define TRACE_TAG TRACE_RWX
18
19 #include "adb_io.h"
20
21 #include <unistd.h>
22
23 #include <base/stringprintf.h>
24
25 #include "adb_trace.h"
26 #include "adb_utils.h"
27 #include "sysdeps.h"
28
SendProtocolString(int fd,const std::string & s)29 bool SendProtocolString(int fd, const std::string& s) {
30 int length = s.size();
31 if (length > 0xffff) {
32 length = 0xffff;
33 }
34
35 return WriteFdFmt(fd, "%04x", length) && WriteFdExactly(fd, s);
36 }
37
SendOkay(int fd)38 bool SendOkay(int fd) {
39 return WriteFdExactly(fd, "OKAY", 4);
40 }
41
SendFail(int fd,const std::string & reason)42 bool SendFail(int fd, const std::string& reason) {
43 return WriteFdExactly(fd, "FAIL", 4) && SendProtocolString(fd, reason);
44 }
45
ReadFdExactly(int fd,void * buf,size_t len)46 bool ReadFdExactly(int fd, void* buf, size_t len) {
47 char* p = reinterpret_cast<char*>(buf);
48
49 size_t len0 = len;
50
51 D("readx: fd=%d wanted=%zu\n", fd, len);
52 while (len > 0) {
53 int r = adb_read(fd, p, len);
54 if (r > 0) {
55 len -= r;
56 p += r;
57 } else if (r == -1) {
58 D("readx: fd=%d error %d: %s\n", fd, errno, strerror(errno));
59 return false;
60 } else {
61 D("readx: fd=%d disconnected\n", fd);
62 errno = 0;
63 return false;
64 }
65 }
66
67 D("readx: fd=%d wanted=%zu got=%zu\n", fd, len0, len0 - len);
68 if (ADB_TRACING) {
69 dump_hex(reinterpret_cast<const unsigned char*>(buf), len0);
70 }
71
72 return true;
73 }
74
WriteFdExactly(int fd,const void * buf,size_t len)75 bool WriteFdExactly(int fd, const void* buf, size_t len) {
76 const char* p = reinterpret_cast<const char*>(buf);
77 int r;
78
79 D("writex: fd=%d len=%d: ", fd, (int)len);
80 if (ADB_TRACING) {
81 dump_hex(reinterpret_cast<const unsigned char*>(buf), len);
82 }
83
84 while (len > 0) {
85 r = adb_write(fd, p, len);
86 if (r == -1) {
87 D("writex: fd=%d error %d: %s\n", fd, errno, strerror(errno));
88 if (errno == EAGAIN) {
89 adb_sleep_ms(1); // just yield some cpu time
90 continue;
91 } else if (errno == EPIPE) {
92 D("writex: fd=%d disconnected\n", fd);
93 errno = 0;
94 return false;
95 } else {
96 return false;
97 }
98 } else {
99 len -= r;
100 p += r;
101 }
102 }
103 return true;
104 }
105
WriteFdExactly(int fd,const char * str)106 bool WriteFdExactly(int fd, const char* str) {
107 return WriteFdExactly(fd, str, strlen(str));
108 }
109
WriteFdExactly(int fd,const std::string & str)110 bool WriteFdExactly(int fd, const std::string& str) {
111 return WriteFdExactly(fd, str.c_str(), str.size());
112 }
113
WriteFdFmt(int fd,const char * fmt,...)114 bool WriteFdFmt(int fd, const char* fmt, ...) {
115 std::string str;
116
117 va_list ap;
118 va_start(ap, fmt);
119 android::base::StringAppendV(&str, fmt, ap);
120 va_end(ap);
121
122 return WriteFdExactly(fd, str);
123 }
124